kotlin broadcastreceiver example

 kotlin broadcastreceiver example

What is BroadcastReceiver in Android with example?

Android BroadcastReceiver is a dormant component of android that listens to system-wide broadcast events or intents. When any of these events occur it brings the application into action by either creating a status bar notification or performing a task. follow the google developer page broadcastreceiver.

follow the function broadcastreceiver:

override fun onStart() {

      super.onStart()

      val intentFilter = IntentFilter(WifiManager.WIFI_STATE_CHANGED_ACTION)

      registerReceiver(wifiStateReceiver, intentFilter)

   }

   override fun onStop() {

      super.onStop()

      unregisterReceiver(wifiStateReceiver)

   }

follow the full example kotlin broadcastreceiver example

1.Brodcast.kt:

package com.akash.kotlin.broadcastreceiver 

import android.content.BroadcastReceiver

import android.content.Context

import android.content.Intent

import android.content.IntentFilter

import android.net.wifi.WifiManager

import android.os.Bundle

import android.widget.Switch

import android.widget.Toast

import androidx.appcompat.app.AppCompatActivity

class Brodcast : AppCompatActivity() {

    lateinit var wifiSwitch: Switch

    lateinit var wifiManager: WifiManager

    override fun onCreate(savedInstanceState: Bundle?) {

        super.onCreate(savedInstanceState)

        setContentView(R.layout.activity_brodcast)

        title = "KotlinApp"

        wifiSwitch = findViewById(R.id.wifiSwitch)

        wifiManager = applicationContext.getSystemService(Context.WIFI_SERVICE) as WifiManager

        wifiSwitch.setOnCheckedChangeListener { _, isChecked ->

            if (isChecked) {

                wifiManager.isWifiEnabled = true

                wifiSwitch.text = "WiFi is ON"

            } else {

                wifiManager.isWifiEnabled = false

                wifiSwitch.text = "WiFi is OFF"

            }

        }

    }

    override fun onStart() {

        super.onStart()

        val intentFilter = IntentFilter(WifiManager.WIFI_STATE_CHANGED_ACTION)

        registerReceiver(wifiStateReceiver, intentFilter)

    }

    override fun onStop() {

        super.onStop()

        unregisterReceiver(wifiStateReceiver)

    }

    private val wifiStateReceiver: BroadcastReceiver = object : BroadcastReceiver() {

        override fun onReceive(context: Context, intent: Intent) {

            when (intent.getIntExtra(WifiManager.EXTRA_WIFI_STATE,

                WifiManager.WIFI_STATE_UNKNOWN)) {

                WifiManager.WIFI_STATE_ENABLED -> {

                    wifiSwitch.isChecked = true

                    wifiSwitch.text = "WiFi is ON"

                    Toast.makeText(this@Brodcast, "Wifi is On", Toast.LENGTH_SHORT).show()

                }

                WifiManager.WIFI_STATE_DISABLED -> {

                    wifiSwitch.isChecked = false

                    wifiSwitch.text = "WiFi is OFF"

                    Toast.makeText(this@Brodcast, "Wifi is Off", Toast.LENGTH_SHORT).show()

                }

            }

        }

    }

}

2.activity_brodcast.xml:

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    tools:context=".Brodcast ">

    <TextView

        android:id="@+id/textView"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_centerHorizontal="true"

        android:layout_marginTop="50dp"

        android:padding="8dp"

        android:text="BrodCast "

        android:textColor="@color/colorPrimaryDark"

        android:textSize="48sp"

        android:textStyle="bold" />

    <Switch

        android:id="@+id/wifiSwitch"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_centerInParent="true" />

</RelativeLayout>

3.AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.akash.kotlin.broadcastreceiver ">

    <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />

    <application

        android:allowBackup="true"

        android:icon="@mipmap/ic_launcher"

        android:label="@string/app_name"

        android:roundIcon="@mipmap/ic_launcher_round"

        android:supportsRtl="true"

        android:theme="@style/AppTheme">

        <activity android:name=".Brodcast">

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

    </application>

</manifest>

4.strings.xml:

<resources>

    <string name="app_name">kotlin broadcastreceiver </string>

</resources>

5.colors.xml:

<?xml version="1.0" encoding="utf-8"?>

<resources>

    <color name="colorPrimary">#6200EE</color>

    <color name="colorPrimaryDark">#3700B3</color>

    <color name="colorAccent">#03DAC5</color>

</resources>

6.styles.xml:

<resources>

    <!-- Base application theme. -->

    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">

        <!-- Customize your theme here. -->

        <item name="colorPrimary">@color/colorPrimary</item>

        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>

        <item name="colorAccent">@color/colorAccent</item>

    </style>

</resources>

7.output: